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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768835802; bh=hckTS3gmFRkxNWBtsceb6zn11jss+f3BKrZwJeC3S+4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=JtnM6QFCOqRvP3fhKJwZe8ubr+qygGq2F6rMhmTS3c+/vs08+wVAKLX9K5sFj5j1Z AuVgg5mIUtvWDPTYM7e01lAWUUsreZe9z2wYkwPqx9s6osoYtpUaYkOtQalRvwKttx hjixW67WN9K8S55vfmvlhrk+sp2DmaDDGTC6vY4JwT62eufHPQPU3pA6Be5f4fDx6r 0pfW1waxsTgYV+OuoG1PKGeLft8fREvhN6RqW0DTO9kOR6wrwQoLWL4Ec+aplCTd/f cz16IZHWD6singoUagzOV+gCSfbkCj1ZMv1o39T1dP0UrUHQDArSEBfMXq49QZXrVm vkvzt5zm/KyzA== Message-ID: Date: Mon, 19 Jan 2026 16:16:34 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] iommu: debug-pagealloc: Remove pfn_valid() usage To: Mostafa Saleh Cc: linux-mm@kvack.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, corbet@lwn.net, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, akpm@linux-foundation.org, vbabka@suse.cz, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, xiaqinxin@huawei.com, baolu.lu@linux.intel.com, rdunlap@infradead.org References: <20260119142246.3821052-1-smostafa@google.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: pxto8jrcregwkxhzs8agnutycugfpeq1 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 34DC8C0013 X-HE-Tag: 1768835803-404074 X-HE-Meta: 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 qKK+WTGF vOkjbKhmRP+LhIPQBnaynFaBTya8aycOCQNKK5tNPF0vuAT9ZvZrUIqeoVWUN73L/ttSXiNuTAdYhyzfxmNuJrrm9stRgY+NHv8PzbSrdHjQPd8jUMIH7cF+ot2RAno3mDTvPV8IJcb2UgYDW1GaDGITDVdrCnVo2ZvBUtTZqxKU5erS2WVMn34lCG9UmeYU8+GiL/R3sxAM5JN/1waJiJpcy5n0pYB9NiFHwDm2HlihxY/J/UujZt0Nod6b0rY6f+TGniRY6d0GhNG0c58yqxJnRwVPh479dOpgkTCjAsSeRJfzvES1GjM+0p7uJGjLHCbCpW+TGjNf0wIjMVGPmCFimTvPsVbO+aTrJAV8a0FVGPkgbLLDraZFjbFBgrGZhZW1qy4BwpYuRLoEdY9KE3dszhA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 1/19/26 16:09, Mostafa Saleh wrote: > On Mon, Jan 19, 2026 at 2:27 PM David Hildenbrand (Red Hat) > wrote: >> >> On 1/19/26 15:22, Mostafa Saleh wrote: >>> This is a small fix for the new config IOMMU_DEBUG_PAGEALLOC based >>> on the discussion: >>> https://lore.kernel.org/linux-iommu/CAFgf54pBAUm3ao-UJksiuGKtvv4wzRyFq_uKwLe0H1ettO4DLQ@mail.gmail.com/ >>> >>> Where it was concluded that pfn_valid() is not enough to validate >>> physical addresses before access to page_ext. >>> >>> The first patch introduces a new function in page_ext that takes a >>> physical address as an argument, and the second patch uses it instead >>> of calling pfn_valid() and phys_to_page() >>> >>> Benchmarks with the new implementation can be found in: >>> https://lore.kernel.org/linux-iommu/20260114164322.787125-1-smostafa@google.com/ >>> >>> This series applies to iommu/core tree. >> >> This is part of v7 [1], right? Can't we just apply v7 instead or are the >> commit IDs already stable? >> > > It should be stable according to Will: > https://lore.kernel.org/linux-iommu/20260114164322.787125-1-smostafa@google.com/T/#m59d0b455e3f2160cb6f9980a0ae65bc481c53898 Shame, probably applied a bit too fast ... -- Cheers David